Heating means for plate cylinders of rotary presses



NOV. 28, 1939. BOYD I 218L690 CYLINDERS 0F no'r Filed Nov. 30, 1938 3Sheets-Sheet l QWQOK K. B fH 5 &:W 0W

ATTORNEY.

D. BOYD -2.18I,690

HEATING MEANS FOR PLATE CYLINDERS 0F ROTARY PRESSES Nov. 28, 1939.

Filed Nov. so, 1938 s Sheets-Sheet 2 ENTOR.

ATTORNEY.

Nov. 28, 1939. D. BOYD HEATING MEANS FOR PLATE CYLINDERS OF ROTARYPRESSES Filed Nov. 30, 1938 3 Sheets-Sheet I5 FIG-3 Ill/IIIVIIIII/III/BY S I VENTOR. w;

Patented Nov. 28, 1939 HEATING MEANS FOR PLATE F ROTARY PBESSES DonaldL. Boyd, Huntington, W. Va., assignor to Oarb-O-Spot Corporation,Athens, Ohio Application November 30, 1938, Serial No. 243,089

'lCiaims.

My invention relates to that class of press whichis employedfor printingspots of wax carbon on sheets of paper. A press of this general type isdescribed in my copending application, Serial No. 216,192, filed June28,1938.

Practice has shown that the wax carbon employed for this' purpose isexceedingly .d'iflicult to handle and has to be maintained at a criticaltemperature or unsatisfactory results will follow.

For example, if the temperature is too high. although the wax carbonwill be transferred to the paper and apparently be a perfect piece ofwork, it will not make copy and will be useless for the purposeintended. This cannot be ascertained until one attempts to use the formthus produced.

On the other hand, if the wax carbon falls below the requiredtemperature, it will not satisfactorily transfer to the printing plateand again the press will not operate.

This is avoided in presses of the reciprocating type by having not onlythe rollers heated, but

. the ink plate, type bed, and various other parts of the press must beheated.

In the rotary presses, it is customary to heat the rollers as well asthe ink fountain in which the wax carbon is melted. This is done in someinstances with electricity. In other cases, with various types ofheating fluids such assteam, hot

oil or water.

In practice, some dimculty hasbeen found in retaining the hot water orhot oil in the joint which connects the rotating parts of the press withthe stationary pipe lines through which the hot oil or water travels.

It has been found impractical to heat the plate cylinder of thepress,and for that reason it has been found necessary to employ the heatingmeans as above described.

I have discovered that I can entirely avoid the necessity of heating anyof the rollers if I enclose the plate cylinder within a heated hood.

The principal object of my invention is to provide a construction whichwill enable heat to be applied to the plate cylinder sons to maintain atemperature which will receive the ink from the form roller and transferit to the paper.

In practice I have been able to produce a highly satisfactory andcommercial job in this manner.

My means of accomplishing the foregoing object may be more readilyunderstood by having reference to the accompanying drawings which arehereunto annexed and are a part of this specification, but which arefurnished. solely for illustrative purposes, inasmuch as it will beobvious to persons skilled in the art that my invention can be appliedto any type of press employed for this purpose which utilizes a printingplate cylinder. In these drawings:

Fig. 1 is a side elevation of my improvement on apress of the typedescribed in my copending application, Serial No. 216,192;

Fig. 2 is the opposite side with the side frame omitted and some of theparts shown in section 10 for the purpose of clearness;

Fig. 3 is a plan view of the ink fountain showing the heating means, andmeans for controlling the heating medium;

Fig. 4 is a sectional view of a portion of the 15 ink fountain, inkfountain roller, form roller, and a fragment of the printing cylinder;and

Fig. 5 is anenlarged fragmentary detail view .of a modified form of hoodwhich is heated by fluid instead of by electricity. 20

Similar reference numerals refer to similar parts throughout the entirespecification.

As shown in the drawings, the press comprises an impression cylinder 1,a printing plate cylinder 2, which are carried by suitable shafts and tjournalled in the side frames 5 and 6 of the press. The plate cylinderis contacted by a form roller I which in turn contacts the ink fountainroller 8, which is partially immersed in the ink fountain 9.

The ink fountain is preferably jacketed for the reception of a heatingfluid. In Fig. 3 I have shown an electrical heating element mounted inthe jacket, for the purpose of heating thefluid. I also show athermostat which may be used to 35 control the heat of the heatingmedium. 0bviously, any form of heating for the ink fountain. which willserve to melt the wax carbon may be employed. Neither of the rollers Inor 8 is heated.v

Radiant heat issupplied to the plate cylinder 2 by means of stripheaters III mounted on the inside of a hood. This hood may be formed intwo parts H and I2 and the strip'heaters l0 dis- 45 posed at suitableintervals around the hood on the inside thereof.

The hood, when in position, as shown in full lines in Fig. 1, enclosesthe plate cylinder 2 as completely as is possible, and yet permits its50 operation.

The section I! of the hood is carried by a support l4 and is pivotallysecured thereto. This support It is attached to the frame in anysuitable or convenient manner. This permits section 55 maintain thetemperature of the strip heaters at e 'the desired degree.

' I have found in some cases that it is desirable to provide asupplementary hood I! which is carried by an arm l8 secured to a shaftI! mounted in a support 20 which is formed on the side frame; A setscrew 2| provides means to hold the hood l1 in an elevated position whenit is desired to get at the impression cylinder l. Normally it occupiesthe position shown in full lines in Fig. i.

This hood I I may also be provided with a plurality of electrical stripheaters 23 and thus serve the double purpose of retaining the heat whichis furnished by the heaters on the hood which encloses the printingcylinders and also by radiant heat sent out by the different parts ofthe press below it.

In some cases it may be found desirable to use another form of heatingmedium for the hoods. Another form is shown in Fig. 5 in which the hood24 is formed with a double wall 25 and 26. The space intermediate thetwo walls being fllled with steam or equivalent fluid heating means suchas" hot wateror hot oil.

It will thus be seen that I have been able in this manner to entirelyavoid the necessity of a connection between a rotating and non-rotatingpart thereof which must be used for the heating fluid; In practice thishas been accompanied by highly satisfactory results. Instead of thefloor adjacent the press being always surrounded with a mass of liquidcaused by the condensation of the steam or leakage of the hot oil or hotwater, it can be kept perfectly dry and clean, thus enabling theproduction'of a higher grade of work. i

It will also be apparent to persons skilled in the art that many changescan be made in the construction adopted to utilize, my invention. Forexample, it may in some cases be found possible to utilize a sun raylamp or strip heaters might be mounted on a skeleton frame instead of ahood. For these reasons, therefore, I do not wish to be understood aslimiting myself to the precise form ofpress or enclosing hoodillustrated; as any heating medium which controls the temperature of theplate or printing cylinder, is intended to be within the scope of thehereinafter contained claims.

Having described my infintiorr, what I regard as new and desire tosecure by Letters Patent is:

1. In a press of thecharacter described, anink fountain, an ink fountainroller partially 1mmersed therein, a form roller contacting saidfountain roller and a plate cylinder contacting said form roller;heating means for said fountain, rollers and cylinder consisting solelyof heating -means for said fountain to maintain fluidity of said formroller; heating means for said fountam.

rollers and cylinder consisting solely of heating means for saidfountain to maintain fluidity of its contents and external radiantheating means partially surrounding said cylinder.

3. In' a press of the character described, an ink fountain, an inkfountain roller partially immersed therein, a form roller contactingsaid fountain roller and a plate cylinder contacting said form roller;heating means for said fountain, rollers and cylinder consisting solelyof. heating means for said fountain to maintain fluidity of its contentsand external radiant heating means arranged in a plurality of hoodspartially enclosing said'cylindei'.

4. In a press of the character described, an ink fountain," an inkfountainrollerl partially immersed therein, a form roller contactingsaid fountain roller and a'plate cylinder contacting said'form roller;heating means for said foun-' tain, rollers and cylinder consistingsolely of heating means for said fountain to maintain fluidity of itscontents and external' radiant electrical heating means for saidcylinder.

5. In a press of the character described, an

ink fountain, an ink fountain roller partially immersed therein, a formroller contacting said fountain roller, a plate cylinder contacting saidform roller, and an impression cylinder; heating means for saidfountain, rollers and cylinders consisting solely of heating means forsaid fountain to maintain fluidity of its contents and 'external radiantheating means for .saidcylinders' 6. In a press of the characterdescribed, an ink fountain, an ink fountain roller partially jimmersedtherein, a form roller contacting said fountain roller and a platecylinder contacting said form roller; heating means for said fountain,rollers and cylinder consisting solely of heating means for saidfountain to maintain fluidity of its contents and external radiantheating means for said cylinder, and means to control the temperature ofsaid radiant heating means.

7. In a press of'the character described, an I inking mechanismcomprising an ink fountain and a printing mechanism comprising a platecyl- DONALD L.

inder in cooperation with said inking mechanism;

